linux-kernel - [PATCHv4, REBASED 0/4] x86: Reduce code duplication on page table initialization

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Message-ID: <20241016111458.846228-1-kirill.shutemov@linux.intel.com>
Date: Wed, 16 Oct 2024 14:14:54 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Baoquan He <bhe@...hat.com>
Cc: Ard Biesheuvel <ardb@...nel.org>,
	Tom Lendacky <thomas.lendacky@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Sean Christopherson <seanjc@...gle.com>,
	linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv4, REBASED 0/4] x86: Reduce code duplication on page table initialization

Use kernel_ident_mapping_init() to initialize kernel page tables where
possible, replacing manual initialization, reducing code duplication.

v4:
 - Reviewed-bys from Kai;
 - Fix comment in acpi_mp_setup_reset() (Rafael);
v3:
 - Reviewed-bys from Tom;
 - Improve commit messages;
v2:
 - A separate patch to change what PA is mapped at relocate_kernel() VA.
 - Improve commit messages;
 - Add Reveiwed-by from Kai;

Kirill A. Shutemov (4):
  x86/mm/ident_map: Fix virtual address wrap to zero
  x86/acpi: Replace manual page table initialization with
    kernel_ident_mapping_init()
  x86/64/kexec: Map original relocate_kernel() in
    init_transition_pgtable()
  x86/64/kexec: Rewrite init_transition_pgtable() with
    kernel_ident_mapping_init()

 arch/x86/include/asm/kexec.h       |  5 +-
 arch/x86/kernel/acpi/madt_wakeup.c | 73 +++++-------------------
 arch/x86/kernel/machine_kexec_64.c | 89 +++++++++++-------------------
 arch/x86/mm/ident_map.c            | 14 +----
 4 files changed, 50 insertions(+), 131 deletions(-)

-- 
2.45.2